Latch and lock.



No. 728,969. PATENTED MAY 26,1903.

G. s. & P. 0. PARSONS.

LATCH AND LOCK.

APPLICATION FILED JUNE 29. 1901. K0 uonnn.

mn- II ili . p d 6 1 \l /M w 8 Z w UNITED STATES Patented May 26, 1903.

PATENT OFFICE.

GUY S. PARSONS AND FRED O. PARSONS, OF BONDURANT, IOWA.

LATCH AND LOCK.

SPECIFICATION forming part of Letters Patent No. 728,969, dated May 26, 1903.

Application filed June 29,1901.

To all whom it may concern:

Be it known that we, GUY S. PARSONS and FRED O. PARSONS, citizens of the United States,residing at Bondurant,in the county of Folk and State of Iowa, have invented certain new and useful Improvements in Mortise Door Latches and Locks, of which thefollowing is a specification.

The object of our invention is to provide a latch and lock of this class of simple, durable, and inexpensive construction and of such compact form that the operative parts may be contained within a cylindrical tube that may be inserted into the round hole bored into the edge of the door, thereby avoiding loss of time incidental to cutting out a rectangular opening for the mortise latch and lock of the usual kind and at the same time providing a latch and lock that may be accurately fitted in position and firmly held when it is fitted.

' A further object is to provide a device of this class with the locking mechanism of simple, durable, and inexpensive construction whereby the latch-bolt will be firmly held in its projected position when the door is locked, so that a second sliding bolt to perform the functions of the locking-bolt is unnecessary.

Our invention consists in certain details in the construction, arrangement, and combination of the various parts of the device whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in our claim, and illustrated in the accompanying drawings, in which- Figure 1 showsa horizontal sectional View through a portion of the door and through our improved lock and latch. Fig. 2 shows a vertical sectional view through the lock and latch.- Fig. 3 shows a transverse sectional view through the indicated line 3 3 of Fig. 1, illustrating the means whereby the parts of the lock and latch are connected with each other. Fig. 4 shows in perspective the two portions of the lock detached.

Referring to the accompanying drawings, we have used the reference-numeral 10 to indicate the door. The door is prepared for receiving the latch and look by first boringa round hole from the edge of the door inwardly, then reaming out the outer end of the opening, and then boring a transverse Serial No- 66,4'73. (N0 model.)

opening intersecting the opening for the latch and lock frame.

The frame of the combined lock and latch is preferably cast of two pieces, each semicircular in shape, thus forming when combined a cylinder. The top half of the cylinder is indicated by the reference-numeral 11 and the lower half by the reference-numeral 12. These parts are preferably connected with each other by means of the screws 13, these forming acomplete cylinder, having its rear end closed. At the front end of the cylinder is a flange or rim 14, the inner surface of which is inclined downwardly and forwardly to the front face of the device, and this rim is provided with openings to receive the screws 15. Obviously by this construction the body portion of the lock-frame may be admitted into the round opening in the edge of theIdoor, and the flange 14. will accurately fit in a reamed-out opening at the end of the opening to receive the lock-frame. In the forward end of the cylindrical lock-frame is a rectangular opening to receive the slidebolt 16. This slide-bolt is of the usual construction and is provided with a bevel-surface 17, and toward its rear end is a part 18, smaller in diameter than the part 16 and provided with a right-angular projection 19 at its rear end.

20 indicates a shoulder formed on the interior of the cylindrical frame, and 21 indi cates an extensile coil-spring with one end engaging the said shoulder and the other engaging the head of the slide-bolt, thus normally projecting the slide-bolt beyond the door.

The reference numeral 22 indicates the shaft of the door-knobs. Said shaft is preferably square in cross-section and is projected through an opening in the door and also through the cylindrical frame. The opening through the cylindrical frame is square, so as to accurately fit-the shaft 22 and prevent its rotation. In the said shaft are abevel-surface 23 and a bevel-surface 24, for purposes hereinafter made clear. On the ends of the shaft 22 are the knobs 25, of which one only is shown in Fig. 1.

The numeral 26 indicates a lever fulcrumed to a pin 27, fixed to the cylindrical frame and having its one end provided with beveled sur- IOC extended position as follows: The reference-- numeral 28 indicates a sliding bolt having a horizontal slot 29 in its forward end. On its under surface and near its rear end is a substantially A-shaped notch 30. Pivoted to the rear end of the bar 28 is a tumbler 31, and this tumbler is provided with a nut 32. near its forward end. A spring 33 normally holds the tumbler to its downward limit of movement, and one of the surfaces of the tumbler overlaps a portion of the A-s-haped notch 30 when the tumbler is held downwardly by this spring. The pin 34: is passed horizontally through the lock-frame and through the slot 29, so that the bar 28 may freely slide in a longitudinal direction. When at the forward end of its movement, this bar engages the rear end of the slide-bolt 17, and when at the rearward limit of its movement the bar is held some distance beyond the rearward limit of movement of the slide-bolt. The bar 35 indicates a keyhole formed in the side of the cylindrical frame adjacent to the notch 30 in the bar 28. Obviously when the key is insorted into keyhole and turned the tumbler 31 will first be elevated to detach it from the rod 34. Then the bar 28 will be moved rearwardly by the key, and in locking the sliding bolt the key first elevates the tumbler, then moves the slide-bolt to its forward limit, and the spring 33 forces the tumbler downwardly, so that the rod 34: is admitted into the notch 32 of the tumbler, whereupon the bar is firmly held against sliding movements.

In practical use the latch and lock is applied to the door by first boring a round hole in the edge of the door and another hole transversely through the door intersecting the first hole. Then the frame is placed in the first hole and held therein by the screws 15. Then the knob-shaft is passed through the other hole and the knobs placed thereon. Assuming the parts to be arranged as shown in Fig. 1, it is obvious by pushing on the knob shown at the bottom of the figure the slide-bolt will be drawn into the frame and the door will then swing open. Furthermore, if the operator approaches the door from the other side the shaft 22 will be drawn toward the operator, thereby producing the same redone by elevating the tumbler 31.

sult. As soon as the knobs are released it is obvious that the spring 21 will project the slide-bolt. So long as the bar 28 is at the rearward limit of its movement it will not in any way interfere with the operation of the bolt. When, however, a key is inserted and the slide-bolt is moved to its forward limit and the tumbler engages the rod 34, the slidebolt will be firmly locked in this position and cannot be withdrawn until the bar 28 has been moved rearwardly, and this can only be Hence a combined lock and latch is provided the mechanism of which is wholly contained within a small cylindrical frame and which is easily and quickly operated without turning the door-knobs.

Having thus described our invention, what we claim, and desire to secu reby'Letters Patent of the United. States therefor, is

An improved door-latch, comprising in combination a cylindrical frame to be inserted in the edge of a door, a knob-shaft passed transversely through the door, through the cylindrical frame and having two inclined surfaces within the cylindrical frame, a lever fulcrumed at one end in the cylindrical frame and having two inclined surfaces bearing against the inclined surfaces of the knobshaft and arranged to be moved rearwardly upon a longitudinal movement of the knobshaft in either direction, a slide-bolt in the cylindrical frame having its outer end projected beyond the door and its inner end extended at right angles and in engagement with the said lever, a spring normally holding the slide-bolt to its outer limit of move ment, a pin extended transversely through the rear portion of the cylindrical frame, a lock-bar in the cylindrical frame having a slot to receive said pin to permit the bar to slide longitudinally on the pin, said lock-bar also having a key-notch and susceptible in one position of engaging the rear end of the slide-bolt to normally hold it to its outer limit of movement, a tumbler pivoted to the lock-bar and having a notch therein, capable of engaging said pin when the slide-boltisat its forward limit of movement, said tumbler arranged adjacent to the key-notch to be raised and lowered by the key, and a spring secured to the slide-bolt to engage the tumbler and normally holding it in position for engaging the pin, substantially as and for the purposes stated.

' GUY s. PARSONS.

FRED o. PARSONS.

Witnesses:

E. A. AUSTIN, B. F. ROTHEROCK. 

